Al-Ti-C-B细化剂对A356铝合金组织和性能的影响

Influence of Al-Ti-C-B Refiner on the Properties and Microstructure of A356 Alloy

通过添加Al-Ti-C-B细化剂,研究了Ti、C、B元素对A356合金中α-Al相及力学性能的影响。结果表明,A356合金中加入Al-Ti-C-B能显著细化α-Al枝晶尺寸至150μm以下,微观组织更加均匀,且细化剂最佳添加量为1.0%(质量分数,下同),合金的抗拉强度为320.8 MPa,伸长率为10.0%。进一步研究表明,Al-Ti-C-B中间合金中含有TCB粒子,能够作为初生α-Al的有效形核质点,从而对A356合金具有高效、长效、稳定的细化效果。

The effects of Al-Ti-C-B master alloy on microstructure and mechanical properties of A356 alloy were investigated.The results indicate that the addition of AlTiCB to A356 alloy can significantly refine the α-Al dendrite,and the grain size can be refined to less than 150 μm.The microstructure becomes more uniform,and the desirable addition amount of trace element AlTiCB is 1.0%,where tensile strength and elongation of the alloy reaches the highest value of 320.8 MPa and 10.0%.The TCB particles existing in the Al-TCB seed alloy play a role of the effective nucleation particle of the primary α-Al,contributing to efficient,long-lasting and stable refining effect on A356 alloy.